school officials immediately le rachel shrineman has three kids at the school and was instantly concerned when she received an e-mail alert about the discovery. >> i have a 7th grader who didn't really know what had happened. my 10th grader had heard, but it was dealt with so quickly that i think the kids felt very safe and i haven't seen my 12th grader yet today. >> reporter: investigators say there was an ammunition magazine in the weapon, but they didn't release any other details about what led them to the locker. >> of course, i mean it's concerning, but it can happen anywhere. so i don't see that robinson is any different than any other school that could have something like this happen. >> reporter: in a letter e- mailed to parents the school's principal says fairfax county police were immediately notified about the incident and he says the suspects involved were identified and questioned. the letter continues. "we recognize the danger associated with any weapon in the school. we will continue to monitor the situation to ensure the safety of students." the principal wrote. as for shr